EP2728049B1 - Waschmaschine und Steuerungsverfahren dafür - Google Patents

Waschmaschine und Steuerungsverfahren dafür Download PDF

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Publication number
EP2728049B1
EP2728049B1 EP13182495.5A EP13182495A EP2728049B1 EP 2728049 B1 EP2728049 B1 EP 2728049B1 EP 13182495 A EP13182495 A EP 13182495A EP 2728049 B1 EP2728049 B1 EP 2728049B1
Authority
EP
European Patent Office
Prior art keywords
motor
tub
vibration sensor
spin
vibration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13182495.5A
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English (en)
French (fr)
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EP2728049A3 (de
EP2728049A2 (de
Inventor
Sung Mo Lee
Kyo Soon Choi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
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Publication of EP2728049A2 publication Critical patent/EP2728049A2/de
Publication of EP2728049A3 publication Critical patent/EP2728049A3/de
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Publication of EP2728049B1 publication Critical patent/EP2728049B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/08—Draining of washing liquids
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/10—Temperature of washing liquids; Heating means therefor

Definitions

  • the present invention relates to a washing machine capable of reducing noise by performing a zero-current control during braking of a motor, and a control method thereof.
  • EP2381026 relates to a washing machine and control method thereof.
  • KR100762145 relates to a method and a device for controlling dehydration of a drum type washing machine to reduce noise of the drum by measuring vibration of the drum and determining dehydration RPM of the drum.
  • a washing machine for example, drum washing machine
  • a tub to store water (for example, wash water or rinse water)
  • a drum rotatably installed in the tub to accommodate laundry
  • a motor to generate a driving force to rotate the drum.
  • Such a washing machine carries out washing in a series of operations of a washing cycle to separate contaminants from laundry with water (specifically, wash water) with detergent dissolved therein, a rinsing cycle to rinse the laundry with water (specifically, rinse water) with no detergent to remove bubbles or residual detergent from the laundry, and a spin-drying cycle to remove moisture contained in the laundry by high-speed rotation of the drum.
  • a washing cycle to separate contaminants from laundry with water (specifically, wash water) with detergent dissolved therein
  • a rinsing cycle to rinse the laundry with water (specifically, rinse water) with no detergent to remove bubbles or residual detergent from the laundry
  • a spin-drying cycle to remove moisture contained in the laundry by high-speed rotation of the drum.
  • a vibration sensor to measure the vibration of the tub is fixedly attached to an upper portion of the tub to detect the vibration of the tub generated due to uneven distribution of the laundry. In this manner, the vibration of the tub is detected by the vibration sensor, and if an excessive vibration is generated during a spin-drying cycle, the motor is put to a braking to stop the spin-drying cycle, and water is supplied again to proceed with a laundry disentanglement cycle, and then a spin-dry cycle retry operation is performed to return to the spin-dry cycle.
  • a short brake method is used in which a switching device at a lower end of an inverter is turned on, and a switching device at an upper end of the inverter is turned off.
  • the short brake method is configured in which a large amount of current flows at the motor, causing noise during the braking.
  • a belt-type brushless direct current (BLDC) motor with noise of a belt added, causes great noise during the brake after a weight detection (sudden acceleration).
  • a washing machine includes a tub, a drum, a motor, a vibration sensor and a controller.
  • the drum may be rotatably installed at an inside the tub.
  • the motor may rotate the drum.
  • the vibration sensor upon entering a spin-dry cycle, may measure vibration of the tub generated by rotation of the motor.
  • the controller may check a fixation state of the vibration sensor by comparing measurement data of the vibration sensor with a reference data.
  • the vibration sensor may be fixedly installed at an upper portion of the tub.
  • the controller may detect weight of laundry by instantaneously accelerating the motor, upon entering the spin-drying cycle.
  • the vibration sensor may measure the vibration of the tub by use of rotary power of the motor generated at the time of the instantaneous acceleration of the motor.
  • the controller may determine the vibration sensor as being in a defective fixation, and brake the motor to stop the spin-drying cycle.
  • the controller may perform a zero-current control.
  • the controller if the measurement data is equal to or greater than the reference data, may determine the vibration sensor as being in a normal fixation, and proceeds with the spin-drying cycle.
  • a washing machine includes a tub, a drum, a motor, a vibration sensor and a controller.
  • the drum may be rotatably installed at an inside the tub.
  • the motor may rotate the drum.
  • the vibration sensor during a spin-drying cycle, may measure vibration of the tub generated by rotation of the motor.
  • the controller may compare measurement data of the vibration sensor with a predetermined excessive vibration data, and if the measurement data is greater than the excessive vibration data, may determine the tub as being in an excessive vibration, and brake the motor by performing a zero-current control.
  • the motor may be a three-phase brushless direct current (BLDC) motor driven by an inverter.
  • BLDC brushless direct current
  • the controller may include a speed command generator to generate a speed command for rotation control of the inverter, a speed regulator to output a command current value according to the speed command of the speed command generator, and a current regulator to output a reference voltage according to the command current value and a phase current of the motor.
  • the controller during the braking of the motor, may perform the zero-current control by setting the command current value input into the current regulator as "0A".
  • a method of controlling a washing machine having a tub, a drum rotatably installed at an inside the tub and a motor to rotate the drum includes upon entering a spin-drying cycle, measuring vibration of the tub generated by rotation of the motor, by use of a vibration sensor, determining whether the vibration sensor is in a defective fixation by comparing measurement data of the vibration sensor with a reference data, and if the measurement data is smaller than the reference data, determining the vibration sensor as being in a defective fixation and braking the motor to stop the spin-drying cycle, and if the measurement data is equal to or greater than the reference data, determining the vibration sensor as being in a normal fixation, and proceeding with the spin-drying cycle.
  • the vibration sensor may be fixedly installed at an upper portion of the tub. In the measuring of the vibration of the tub, upon entering the spin-drying cycle, vibration of the tub generated by rotation of the motor when the motor is instantaneously accelerated to detect weight of laundry may be measured.
  • the motor may be a three-phase brushless direct current (BLDC) motor driven by an inverter.
  • BLDC brushless direct current
  • the motor may be braked by performing a zero-current control with a command current value of the inverter set to "0A".
  • a zero-current control is performed by driving a current regulator with a command current set to "0A", so that the current flowing at the motor decrease and thus noise is reduced.
  • BLDC belt-type brushless direct current
  • a fixation state of the vibration sensor to the tub is checked in advance by use of measurement data of the vibration sensor at a weight detection stage in the beginning of the spin drying cycle, and in a case in which the vibration sensor is not normally fixed to the tub during proceeding with the spin-drying cycle, a product liability (PL) accident that may occur due to the movement of the washing machine or the frame touch caused by an erroneous detection of vibration or a failure of vibration detection can be prevented.
  • PL product liability
  • FIG. 1 is a perspective view illustrating an external appearance of a washing machine in accordance with an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view illustrating the configuration of a washing machine in accordance with an embodiment of the present disclosure.
  • a washing machine 1 in accordance with an embodiment of the present disclosure includes a body 10 having an approximate box shape and forming an external appearance of the washing machine 1, a tub 11 provided in a drum type while being installed at an inside the body 10 to accommodate water (for example, wash water or rinse water), and a drum 12 rotatably installed at an inside the tub 11 and provided in the shape of a cylinder having a plurality of holes 13.
  • a vibration sensor 14 is fixedly attached to an outside of an upper portion of the tub 11 to measure the vibration of the tub 11 generated during the operation of the washing machine 1.
  • the vibration sensor 14 may be provided using, for example, a micro electric mechanical system (MEMS) sensor to measure a displacement of the tub 11 moved according to the vibration of the tub 11, a three-axes acceleration sensor to measure vibrations of three axes directions (X-axis direction, Y-axis direction and Z-axis direction), and an angular velocity sensor, referred to as a gyro sensor.
  • MEMS micro electric mechanical system
  • a displacement signal measured by the vibration sensor 14 is mainly used to by estimate a balance state of laundry in the drum 12 at the time of acceleration from a low speed to a high speed and to determine whether to operate a high-speed spin drying, to reduce the vibration of the tub 11.
  • an upper and lower direction displacement of the drum 12 occurs due to a mechanical falling of laundry, and such an upper and lower direction displacement of the drum 12 may be measured through the vibration sensor 14.
  • a motor 15 serving as a driving device is installed at an outside of the lower portion of the tub 11 to rotate a rotating shaft 12a connected to the drum 12 to perform a washing cycle, a rinsing cycle and a spin-dying cycle.
  • the motor 15 is provided using a three-phase brushless direct current (BLDC) motor including a permanent magnet and an electromagnet, and the three-phase BLCD motor, hereinafter, referred to as a motor, is driven by an inverter that supplies three-phase alternating current by switching a voltage according to a pulse width modulation signal.
  • BLDC brushless direct current
  • inverter that supplies three-phase alternating current by switching a voltage according to a pulse width modulation signal.
  • the driving device to rotate the drum 12 includes a pulley 15b and a rotating belt 15c that deliver power to the drum 12.
  • the rotating belt 15c is installed to be wound around an outer surface of the drum 12 and the pulley 15b, which is coupled to a shaft 15a of the motor 15.
  • a water level sensor 16 is installed to detect a frequency that varies with the water level so as to detect the amount of water (water level), a washing heater 17 is installed to heat water contained in the tub 11, and a temperature sensor 18 is installed to detect the temperature of water (wash water or rinse water) in the tub 11.
  • a door 19 is installed at a front portion of the body 10 such that a laundry is put in or taken out of the inside of the drum 12.
  • a detergent supply device 20 to supply detergent, and a water supply device 30 to supply water (wash water or rinse water) are installed.
  • the detergent supply device 20 has an inside divided into a plurality of spaces, and is installed adjacent to the front portion of the body such that a user may easily input detergent and fabric softner into each space.
  • the water supply device 30, in order to supply water (wash water or rinse water) to the inside the tub 11, includes a cold water supply pipe 31 and a hot water supply pipe 32 connecting an outside water supply pipe to the detergent supply device 20, a cold water valve 33 and a hot water valve 34 that are installed amid the cold water supply pipe 31 and the hot water supply pipe 32, respectively, to control water supply, and a connection pipe 35 connecting the detergent supply device 20 to the tub 11.
  • a cold water supply pipe 31 and a hot water supply pipe 32 connecting an outside water supply pipe to the detergent supply device 20
  • a cold water valve 33 and a hot water valve 34 that are installed amid the cold water supply pipe 31 and the hot water supply pipe 32, respectively, to control water supply
  • a connection pipe 35 connecting the detergent supply device 20 to the tub 11.
  • a control panel 40 on which various buttons and a display are disposed for control of the washing machine 1 is provided above a front of the body 10, and a detergent input portion 21 which is connected to the detergent supply device 20 to put laundry detergent is provided on one side portion of the control panel 40.
  • the buttons are used for the control panel 40 as an example, a touch screen or other input method may be provided for the control panel 40.
  • the washing machine 1 includes a drainage device 50 to draing the water contained in the tub 11.
  • the drainage device 50 includes a first drainage pipe 51 connected to the lower portion of the tub 11 to drain the water of the tub 11 to the outside, a drainage pump 52 installed on the first drainage pipe 51, and a second drainage pipe 53 connected to an exit of the drainage pump 52.
  • the washing machine 1 in order to reduce vibration generated during the operation of washing machine 1, includes a suspension spring 60 elastically supporting the tub 11 from the upper portion of the tub 11, and a damper 62 to reduce vibration at the lower portion of the tub 11.
  • the suspension spring 60 and the damper 62 movably support the tub 11 at the upper portion and the lower portion of the tub 11, respectively. That is, as the tub 11 is shaken by the vibration shaking force generated during the rotation of the drum 12, vibration occurs in all directions such as forward, backward, left, right, upward and downward, and such vibration of the tub 11 is reduced by the suspension spring 60 and the damper 62.
  • FIG. 3 is a control block diagram of a washing machine in accordance with an embodiment of the present disclosure.
  • the washing machine 1 in accordance with an embodiment of the present disclosure includes an input unit 70, a controller 72, a memory 73, a driving unit 74, and a display unit 76.
  • the input unit 70 is for a user to input commands to execute the washing cycle, rinsing cycle and spin-drying cycle of the washing machine 1 through manipulation of the user, and may include keys, buttons, switches and touch pad or the like and include all devices that generate predetermined input data by manipulation of pushing, touching, pressing and rotating.
  • the input unit 70 is provided on the control panel 40, and includes a plurality of buttons (for example, power, reservation, wash water temperature, soaking, rinsing, spin-drying, type of detergent, etc) to input user commands related to the operation of the washing machine 1.
  • the plurality of buttons may include a course selection button to select one of a plurality of washing courses (for example, a standard course, a wool course, and a delicate course, for example, the standard course selected by a user depending on the type of laundry) depending on the type of laundry input into the washing machine 1.
  • the controller 72 is a microcomputer to control the overall operation of the washing machine 1, such as washing, rinsing and spin-drying, according to operation information being input from the input unit 70, and sets a target wash water level, a target rinse water level, a target Revolutions Per Minute (RPM) and a motor operating rate (for example, motor on-off time), a washing time and a rinsing time according to the weight or load of laundry in the selected washing course.
  • a target wash water level a target rinse water level
  • RPM Revolutions Per Minute
  • motor operating rate for example, motor on-off time
  • the controller 72 in the beginning of the spin-drying cycle, checks a fixation state of the vibration sensor 14 with respect to the tub 11 in a weight detection stage of instantaneously accelerating the motor 15 to detect the weight or load of the laundry. That is, it is checked whether the vibration sensor 14 is fixedly attached to the tub 11 in a normal manner, in other words securely attached, by use of rotating power of the motor 15 generated during the instantaneous acceleration of the motor 15 in the weight detection stage in the beginning of the spin-drying cycle. To this end, the controller 72 receives vibration displacement data of the tub 11 being measured through the vibration sensor 14, which is fixed at the upper portion of the tub 11, at the instantaneous acceleration of the motor 15.
  • the controller 72 compares the measurement data of the vibration sensor 14 with predetermined reference data (for example, displacement data used to determine whether the vibration sensor is normally fixed to the tub at the instantaneous acceleration of the motor). As a result of comparison, if the measurement data of the vibration sensor 14 is smaller than the reference data, the fixation state of the vibration sensor 14 is determined as being defective, and the spin-drying cycle may end. In this case, the controller 72 notifies the user of the defective fixation state of the vibration sensor 14 through the display unit 76.
  • predetermined reference data for example, displacement data used to determine whether the vibration sensor is normally fixed to the tub at the instantaneous acceleration of the motor.
  • the controller 72 checks the fixation state of the vibration sensor 14 with respect to the tub 11 in advance in the beginning of the spin-drying cycle, thereby preventing the washing machine from being moved and preventing a frame touch.
  • the controller 72 may check whether the vibration sensor 14 is normally fixed to the tub 11 by calculating the average of the measurement data or measurement counts at the weight detection stage in the beginning of the spin-drying cycle.
  • the controller 72 measures the vibration of the tub 11 generated by the rotating power of the motor 15 in the spin-drying cycle, and if an excessive vibration occurs, stops the spin-drying cycle by braking the motor 15, and supplies water again to proceed with a laundry disentanglement cycle, and then performs a spin-dry retry operation to return to the spin-drying cycle.
  • the controller 72 upon the excessive vibration of the tub 11, performs a zero-current control to brake the motor 14.
  • the zero-current control represents controlling an inverter while setting a command current value to 0A (Ampere) at the braking of the motor 15.
  • the zero-current control will be described later with reference to FIG. 5 in detail.
  • a section at which the zero-current control is performed to brake the motor 15 is applied to a case when the spin-drying cycle is stopped after being normally carried out, or case when the spin-drying cycles encounters an error, in addition to the case when the excessive vibration of the tub 11 occurs.
  • the memory 73 includes setting information such as control data to control the operations of the washing machine 1, reference data used in control of the operations of the washing machine 1, operation data generated while the washing machine 1 is performing a predetermined operation, and setting data input by the input unit 70 for the washing machine 1 to perform a predetermined operation, use information including the number of times that the washing machine 1 performs a specific operation and model information of the washing machine 1, and failure information including the cause of malfunction or the location of malfunction in case of malfunction of the washing machine 1.
  • the driving unit 74 drives the motor 15, the washing heater 17, the cold water valve 33, the hot water valve 34 and the drainage pump 52 that are related to the operation of the washing machine 1 according to a driving control signal.
  • the display unit 76 is provided on the control panel 40, and displays the operation state and the user manipulation state of the washing machine 1 according to a display control signal of the controller 72.
  • FIG. 4 is a circuit diagram of an inverter to drive a motor of the washing machine in accordance with an embodiment of the present disclosure.
  • an inverter circuit to drive the motor 15 in accordance with an embodiment of the present disclosure includes a rectifier 102 to rectify a commercial power (mains voltage) 100 being supplied in the form of alternating current of eg. 220V-60Hz, a smoother-electrolytic condenser (capacitor) 104 connected to the rectifier 102 to smooth a rectified direct current voltage and accumulate electrical energy, an inverter 106 connected to the smoother-electrolytic condenser 104 to convert the direct current voltage being output from the smoother-electrolytic condenser 104 into three-phase alternating current (U, V and W) in the form of a pulse having a random variable frequency by way of pulse-width modulation to drive the motor 15, a current sensor 108 to detect a phase current of the motor 15, and the controller 72 to control the inverter 106 by outputting a Pulse Width Modulation (PWM) signal pattern being provided to the inverter 106
  • PWM Pulse
  • the inverter 106 is an intelligent power module (IPM) configured to convert a direct current voltage into three-phase alternating current while having six switching devices (insulated-gate bipolar transistors :IGBT) connected to six diodes (fast recovery diodes: FRD) in the form of a three-phase full bridge, and supply the three-phase alternating current to the motor 15.
  • IPM intelligent power module
  • the current sensor 108 is configured to detect the magnitude of load current (phase current) being supplied to the motor 15, and input the detected magnitude of load current into an A/D converter of the controller 72.
  • the current sensor 108 may be implemented in a desired manner generally known in the art.
  • the current sensor 108 may be implemented in a manner to directly detect three-phase current by using a current transformer (CT) or a series shunt resistant for each of the three phases, or in a manner to detect two phase current by use of two current transformers or two series direct shut resistors and then estimate the remaining current based on the detected current values of the two phases.
  • CT current transformer
  • a series shunt resistant for each of the three phases
  • two phase current by use of two current transformers or two series direct shut resistors and then estimate the remaining current based on the detected current values of the two phases.
  • the controller 72 is a microcomputer to controls the on/off of the six switching devices of the inverter 106, and generate three-phase alternating current of a random voltage and a random frequency, and the driving of the motor 15 through the PWM control is generally known in the art.
  • controller 72 for rotation control of the inverter 106 outputs a pattern of PWM signals being supplied to the inverter 106, by detecting a direct current voltage Vdc linked to the smoother-electrolytic condenser 104 and detecting phase current of the motor 15 through the current sensor 108.
  • FIG. 5 is a control block diagram of a zero-current control of an inverter in accordance with an embodiment of the present disclosure.
  • the controller 72 for the zero-current control includes a speed command generator 721 to generate a speed command for rotation control of the inverter 106, a speed regulator 722 to output a command current value according to the speed command of the speed command generator 721 and a speed estimation value, and a current regulator 723 to output a reference voltage to drive the motor 15, according to the command current value of the speed regulator 722 and a phase current (for example, measurement current) of the motor 15, and a speed/position estimator 724 to estimate speed and position of the motor 15 according the phase current (for example, measurement current) of the motor 15 and the reference voltage being output from the current regulator 723 to deliver a speed estimation and a position estimation value to the speed regulator 722 the current regulator 723, respectively.
  • a speed command generator 721 to generate a speed command for rotation control of the inverter 106
  • a speed regulator 722 to output a command current value according to the speed command of the speed command generator 721 and a speed estimation value
  • a current regulator 723 to output a reference
  • the controller 72 brakes the motor 15 when the tub 11 comes upon an excessive vibration, a spin-drying cycle is stopped after being normally carried out or a spin-drying cycle encounters an error.
  • the controller 72 performs the zero-current control by setting the command current value, being input to the current regulator 723, to "0A".
  • FIG. 6 is a flow chart of a control method to determine a fixation state of the vibration sensor of the washing machine in accordance with an embodiment of the present disclosure.
  • the operation information selected by the user is input to the controller 72 through the input unit 70.
  • the controller 72 performs a series of sequential operations of a washing cycle, a ringing cycle and a spin-drying cycle according to the operation information input from the input unit 70.
  • the controller 72 determines a spin-drying cycle (200) is performed, and if determined as a spin-drying cycle is performed, operates the drainage pump 52 through the driving unit 74 so that the water in the tub 11 is drained to the outside by passing through the first drainage pipe 51 and the second drainage pipe 53.
  • the controller 72 detects the weight of laundry being put into the drum 12, in the beginning of the spin-drying cycle to proceed with the spin-drying cycle.
  • a method of detecting the weight of laundry it is possible to employ any one method of detecting the weight by use of a time taken to reach a predetermined speed or a predetermined revolution per minute (RPM) through instantaneous acceleration of the motor 15, and detecting the weight of laundry by applying a torque to the motor 15 for a predetermined time to directly or indirectly measure the inertial quantity of the drum 12 and then by using the second low of motion (torque-inertial moment x angular velocity), as disclosed in Japanese Patent Publication Nos. 2002-336593 , 2004-267334 , and H07-90077 .
  • RPM revolution per minute
  • the controller 72 instantaneously accelerates the motor 15 through the driving unit 74 at a predetermined RPM (about 90RPM) or above (202).
  • a vibration of the tub 11 occurs due to the rotating power of the motor 15 generated at the instantaneous acceleration
  • the vibration sensor 14 fixedly attached to the upper portion of the tub 11 measures the vibration of the tub 11 generated due to the rotating power of the motor 15 at the instantaneous acceleration of the motor 15 and inputs the measured vibration to the controller (204).
  • the controller 72 compares the input measurement data of the vibration sensor 14 with a predetermined reference data (for example, a displacement value used to determine whether the vibration sensor is normally fixed to the tub at the moment of instantaneous acceleration of the motor) (206).
  • a predetermined reference data for example, a displacement value used to determine whether the vibration sensor is normally fixed to the tub at the moment of instantaneous acceleration of the motor
  • the controller 72 determines that the fixation state of the vibration sensor 14 is defective (208), and ends the spin-drying cycle while displaying the defective fixation state of the vibration sensor 14 through the display unit 76.
  • the controller 72 determines that the fixation state of the vibration sensor 14 is normal (212), and proceeds with the spin-drying cycle in a normal manner (214).
  • the vibration sensor 14 if the vibration sensor 14 is securely attached, it would be expected that the sensor would produce an output level above a reference level when the tub starts to vibrate, while producing an output level below a reference level if the sensor is not properly attached so that it does not fully pick up the vibrations of the tub.
  • the fixation state of the vibration sensor 14 with respect to the tub 11 is checked in advance by use of the measurement data of the vibration sensor 14 in the washing machine having the vibration sensor 14 attached to the tub 11. Accordingly, when the vibration sensor 14 is not normally fixed to the tub 11 in proceeding with the spin-drying cycle, a product liability (PL) accident due to the movement of the washing machine or a frame touch that may be caused by an erroneous detection of vibration or failure of vibration detection may be prevented.
  • PL product liability
  • FIG. 7 is a flow chart of a control method to stop a motor of the washing machine in accordance with an embodiment of the present disclosure.
  • a user puts laundry into the drum 12, and selects operation information, such as a washing course or an additive rinsing, by manipulating the buttons of the input unit 70 disposed on the control panel 40, and the operation information selected by the user is input to the controller 72 through the input unit 70. Accordingly, the controller 72 performs a series of sequential operations of a washing cycle, a rinsing cycle and a spin-drying cycle according to the operation information input from the input unit 70.
  • the controller 72 determines a spin drying cycle (300), and if determined as a spin-drying cycle, proceeds with the spin-drying cycle at a predetermined final spin-drying RPM (about 700RPM to about 1000 RPM) (302).
  • the vibration sensor 14 fixedly attached to the upper portion of the tub 11 measures the vibration of the tub 11 generated due to high speed rotation of the drum 12 in the spin-drying cycle, and inputs the measured vibration to the controller 72 (304).
  • the controller 72 compares the input measurement data of the vibration sensor 14 with a predetermined excessive vibration data (for example, displacement data used to determine an excessive vibration of the tub in the spin-drying cycle), and determines whether an excessive vibration occurs (306).
  • a predetermined excessive vibration data for example, displacement data used to determine an excessive vibration of the tub in the spin-drying cycle
  • the controller 72 brakes the motor 15 through a zero-current control (308).
  • a commercial power 100 is input, and the power in the form of an alternating current of 220V(Volt)-60Hz (Hertz) is rectified by the rectifier 102, and the rectified power is smoothed by the smoother-electrolytic condenser 104 connected to the rectifier 102 to be converted into a direct current for output.
  • 220V(Volt)-60Hz Hertz
  • the direct current voltage being output from the smoother electrolytic condenser 104 is converted into three-phase alternating current having random variable frequencies by way of a pulse-width modulation (PWM) at the inverter 106, and then is supplied to the motor 15 so that the motor 15 is driven.
  • PWM pulse-width modulation
  • the driving of the motor 15 through the PWM control is generally known in the art, and thus detailed description thereof will be omitted.
  • the controller 72 In order to perform the zero-current control in accordance with the present disclosure, the controller 72, at the braking of the motor 15, sets the command current value input into the current regulator 723 as "0A".
  • the current regulator 723 By setting the command current value as “0A”, the current regulator 723 outputs a reference voltage to drive the motor 15 according to the command current value of "0A” and the phase current (measurement current) of the motor 15 detected by the current sensor.
  • the current being supplied to the motor 15 decreases due to the command current value of "0A", thereby increasing the time to brake the motor 15 when compared to the braking time of the short brake method, while reducing the noise.
  • Such a noise reduction is more effective at a belt type small-middle sized washing machine.
  • the RPM is lowered by braking the motor 15 through the zero-current control, and water is supplied through the cold water valve 33 or the hot water valve 34 (310).
  • the controller 72 drives the motor 15 to perform a laundry disentanglement of shaking and releasing the entanglement of laundry by alternately rotating the drum 12 (312), and returns to operation 302 to proceed with the spin-drying cycle again. Meanwhile, if determined from operation 306 that an excessive vibration does not occur, the controller 72 determines whether the spin-drying cycle is completed to proceed with a normal spin-drying cycle (314).
  • the controller 72 If determined from operation 314 that the spin-drying cycle is not complete, the controller 72 returns to operation 302 to proceed with the spin-drying cycle.
  • the controller 72 brakes the motor 15 through the zero-current control (316), and ends the spin-drying cycle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (7)

  1. Waschmaschine (1), die Folgendes umfasst:
    eine Wanne (11);
    eine Trommel (12), die drehbar in der Wanne (11) installiert ist;
    einen Motor (15) zum Drehen der Trommel (12);
    einen Vibrationssensor (14), ausgelegt zum Messen von Vibrationen der Wanne (11), die durch die Drehung des Motors (15) nach dem Eintritt in einen Schleudertrocknungszyklus erzeugt werden; und
    eine Steuerung (72), dadurch gekennzeichnet, dass die genannte Steuerung (72) zum Prüfen des Fixationszustands des Vibrationssensors (14) durch Vergleichen von Messdaten des Vibrationssensors (14) mit Referenzdaten ausgelegt ist;
    wobei die Steuerung (72), wenn die Messdaten des Vibrationssensors (14) kleiner sind als die Referenzdaten, so ausgelegt ist, dass sie feststellt, dass der Vibrationssensor (14) in einem defekten Fixationszustand ist, und so ausgelegt ist, dass sie den Motor (15) bremst, um den Schleudertrocknungszyklus zu stoppen; und
    wobei die Steuerung (72), wenn die Messdaten des Vibrationssensors (14) gleich oder größer als die Referenzdaten sind, so ausgelegt ist, dass sie feststellt, dass der Vibrationssensor (14) in einem normalen Fixationszustand ist, und mit dem Schleudertrocknungszyklus fortfährt.
  2. Waschmaschine (1) nach Anspruch 1, wobei der Vibrationssensor (14) in einem oberen Teil der Wanne (11) fest installiert ist.
  3. Waschmaschine (1) nach Anspruch 1, wobei die Steuerung (72) das Gewicht der Wäsche durch momentanes Beschleunigen des Motors (15) nach dem Eintritt in den Schleudertrocknungszyklus detektiert.
  4. Waschmaschine (1) nach Anspruch 3, wobei der Vibrationssensor (14) die Vibrationen der Wanne (11) durch Nutzen der Drehkraft des Motors (15) misst, die zur Zeit der momentanen Beschleunigung des Motors (15) erzeugt wird.
  5. Waschmaschine (1) nach einem der vorherigen Ansprüche, wobei die Steuerung (72) während des Bremsens des Motors (15) so ausgelegt ist, dass sie den durch den Motor (15) fließenden Strom auf null reduziert.
  6. Verfahren zum Steuern einer Waschmaschine (1) mit einer Wanne (11), einer drehbar im Inneren der Wanne (11) installierten Trommel (12), einer Steuerung (72) und einem Motor (15) zum Drehen der Trommel (12), wobei das Verfahren dadurch gekennzeichnet ist, dass es die folgenden Schritte beinhaltet:
    Messen, nach dem Eintritt in einen Schleudertrocknungszyklus, von durch Drehen des Motors (15) erzeugten Vibrationen der Wanne (11) mit Hilfe eines Vibrationssensors (14); und
    Feststellen, ob der Vibrationssensor (14) in einem defekten Fixationszustand ist, durch Vergleichen von Messdaten des Vibrationssensors (14) mit Referenzdaten;
    Feststellen, wenn die Messdaten des Vibrationssensors (14) kleiner sind als die Referenzdaten, dass der Vibrationssensor (14) im defekten Fixationszustand ist, und Bremsen des Motors (15) zum Stoppen des Schleudertrocknungszyklus; und
    Feststellen, wenn die Messdaten des Vibrationssensors (14) gleich oder größer als die Referenzdaten sind, dass der Vibrationssensor (14) in einem normalen Fixationszustand ist, und Fortsetzen des Schleudertrocknungszyklus.
  7. Verfahren nach Anspruch 6, wobei beim Messen der Vibrationen der Wanne (11), nach dem Eintritt in den Schleudertrocknungszyklus, die durch die Drehung des Motors (15) erzeugten Vibrationen der Wanne (11), wenn der Motor (15) zum Detektieren des Gewichts von Wäsche momentan beschleunigt wird, gemessen werden.
EP13182495.5A 2012-10-31 2013-08-30 Waschmaschine und Steuerungsverfahren dafür Active EP2728049B1 (de)

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US9528212B2 (en) 2016-12-27
US20140115792A1 (en) 2014-05-01
CN103789964B (zh) 2017-11-14
CN103789964A (zh) 2014-05-14
EP2728049A3 (de) 2014-07-02
KR20140055262A (ko) 2014-05-09
KR101980854B1 (ko) 2019-05-22
EP2728049A2 (de) 2014-05-07

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